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  1. Eduardo1982

    API 650 - tolerances for 7.3.5.8 ?

    Hello everyone. According to API 650 paragraph 7.3.7.9 it is necessary to make some internal measurements in the tank before and after the hydrotest. What I understand is that with these measurements we could estimate some internal settlement at the bottom of the tank... but is there any...
  2. Eduardo1982

    How to measure the expansion of a tank using some automatic equipment?

    Hello guys. I am not sure where should I include this topic but currently I have a tank that I wish to measure in an automatic way its expansion (it will be heated to 300°C) and wanna know if circunferentially all points dilate in good way.. does anyone know if there are ny equipement or device...
  3. Eduardo1982

    Heat exchangers U-tube - Tube failure

    Dear guys. Does anyone have experience in tube failure in heat exchangers type "U"? Actually we have had a failure in a heat exchanger and we foudn that 1 tube was broken. We are recovering all data from previous to event, however I dont lnow if you guys could recognize the failure with...
  4. Eduardo1982

    347H vs 347

    Hey guys. Does anyone is familiar with 347H Stainless Steel? I have read that this material is highly recommended to work in solar industry (high temperature and working with molten salts). Actually I wish to know why this 347H is recommended instead of 347. Is there any literature that talks...
  5. Eduardo1982

    Stainless Steel with high content of Carbon

    Dear guys. Is it possible to have an stainless steel (austenitic) with a carbon percentage of 0.20%? I have never seen such high content since I remember that less than 0,10% carbon content is normal.
  6. Eduardo1982

    Bottom tank plate - edge settlement or deformation?

    Hey guys. In my workplace we have a storage tank that works around 350 °C. During an outage we drainaged the liquid and started to perform a inspecion (internal and external too removing the insulation). We have noted that the bottom plate (edge side) has been deformed as shows in pictures...
  7. Eduardo1982

    what could happen with a P91 pipe and welds on service without PWHT

    Dear guys. I know it is a crazy question, but what could happens with a P91 pipe and welds on steam service what is working under pressure and without PWHT? Even if it is a temporal pipe (and probably it can be used for a couple of weeks on use) are there any "method" to follow to assure that...
  8. Eduardo1982

    Bottom plates inspection of storage tank (on service).

    Hey guys. Hope everybody is fine. Do you know is there are any method, technique or other test that could be carried out to check bottom plates of a storage tank (it contains molten salts at 500°C)? We wish to know bottom plates integrity. We can access to bottom plate external (as it can be...
  9. Eduardo1982

    Reinforcement plate installed to keep tolerance inside of tank

    Hey guys. Is in the API 650 code any paragraph that forbid to use reinforcement plates intalled inside of the tank to keep and fit peaking & banding tolerances? I attach a picture that shows plates welded. Personally, I think that it is a bad practise and it can affect the performance of the...
  10. Eduardo1982

    Hydrotest prior of NDT and PWHT

    Hey guys I hope ervtybody here is fine. I wish to know yuor ideas in regards of the next topic. As it is stipulated in several docs and codes PWHT and NDT must be done before of any test pressure on lines. In many systems, like steam lines to turbines or boilers, the chemical cleaning and steam...
  11. Eduardo1982

    What happen after steam blowing process finished?

    Hey guys. I hope everybody are fine. Are there any recommended practise or standard code that establish how long can wait my boiler and pipes from finished steam or air blowing to start-up without preservation?
  12. Eduardo1982

    Modified tensile strenght test

    Hey guys I hope everybody are fine during COVID storm. Does anybody knows if there are any way to check the next matter?... My friend and I decided to perform a kind of "modified tensile strenght test" over two fittings as it shows the picture below. We did not find any way to perform the...
  13. Eduardo1982

    Is it allowed for a pipeline of fire water and electrical conduits to pass through the same opening?

    Hello guys.. in my current Project, the contractor has installed a wáter pipeline for fire fighting system passing trought the same opening with electrical conduits (as you can see in picture lines below). It is allowed under NFPA? All FF installations must follow-up NFPA codes. I would...
  14. Eduardo1982

    Fresh water in contact with SS tank - API 650

    Dear Guys. According to API 650, S Annex (S.4.10.4) - For hydrotest water quality - When testing other fresh water, the exposure time shall not exceed 7 days.. what it means? Currently I am going to test a tank of 22000 m3 (Stainless Steel) with a non potable water but with the quality enough to...
  15. Eduardo1982

    Steel I beam with superficial deffects

    Daer guys. I have found in a mil Steel I beam superficial deffects.. It looks like some longitudinal cracks in several points and with long lenghts. Does anybody had lived something similar? for me it is my first case in many years. I attach some pics...
  16. Eduardo1982

    WPS for SS 347H using 347 electrode

    Dear guys, Has anybody had experience welding SS 347H using E347 electrodes? Specs of client strongly recommend to weld SS 347H using 347 electrodes.. but does anybody knows why?.. even E16-8-2 could be rejected… if someone knows about that could be a great help!
  17. Eduardo1982

    Corrosion test for heat exchanger tubes

    Dear all. Does any know if according to ASME VIII is it required to perform any test to heat exchanger tubes related to corrosión performance?.. I have a heat exchanger which Will be used in corrosive considition (tubes made of Inconel 625 - the fluid is molten salts.. average working...
  18. Eduardo1982

    welding SS347H (heat treatment required)?

    Hey guys, I am going to weld SS 347H. As far as I know, this kind of alloy is prone to be a problem during service (probably SCC problem). Actually I have selected an electrode free of rutile (it was an advice I read on many papers) and I perform some tests (according to ASME IX - tensile...
  19. Eduardo1982

    cracks in malleable iron threaded 90° elbow

    Hey guys. In a construction project we were facing some problems with some malleable iron threaded 90° elbows. During some pneumatic tests two elbows failed (I attach some picturees). We think that the problem is bad practise during construction by the contractor (due to excessive wrenchs...
  20. Eduardo1982

    UT in ASME I

    Hey guys. I am involved in a construction of a boiler in site and soon I am going to start NDT on welded joints . I was thinking to perform RT but due to little access in some cases UT, too. The client´s inspector has told us that the UT technique approved by ASME I is only phased array semi or...

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